261450045 has 32 divisors (see below), whose sum is σ = 471363840. Its totient is φ = 137471040.

The previous prime is 261450043. The next prime is 261450047. The reversal of 261450045 is 540054162.

261450045 is a `hidden beast` number, since 2 + 614 + 5 + 0 + 0 + 45 = 666.

It is an interprime number because it is at equal distance from previous prime (261450043) and next prime (261450047).

It is not a de Polignac number, because 261450045 - 2¹ = 261450043 is a prime.

It is a super-2 number, since 2×261450045² = 136712252061004050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261450043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4054 + ... + 23223.

It is an arithmetic number, because the mean of its divisors is an integer number (14730120).

Almost surely, 2^261450045 is an apocalyptic number.

It is an amenable number.

261450045 is a deficient number, since it is larger than the sum of its proper divisors (209913795).

261450045 is a wasteful number, since it uses less digits than its factorization.

261450045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27362 (or 27356 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 261450045 is about 16169.4169653701. The cubic root of 261450045 is about 639.4347589074.

The spelling of 261450045 in words is "two hundred sixty-one million, four hundred fifty thousand, forty-five".