31461145 has 8 divisors (see below), whose sum is σ = 38674440. Its totient is φ = 24554880.

The previous prime is 31461127. The next prime is 31461149. The reversal of 31461145 is 54116413.

It can be written as a sum of positive squares in 4 ways, for example, as 3455881 + 28005264 = 1859^2 + 5292^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31461145 - 2⁵ = 31461113 is a prime.

It is a super-2 number, since 2×31461145² = 1979607289422050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31461149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76530 + ... + 76939.

It is an arithmetic number, because the mean of its divisors is an integer number (4834305).

Almost surely, 2^31461145 is an apocalyptic number.

It is an amenable number.

31461145 is a deficient number, since it is larger than the sum of its proper divisors (7213295).

31461145 is a wasteful number, since it uses less digits than its factorization.

31461145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153515.

The product of its digits is 1440, while the sum is 25.

The square root of 31461145 is about 5609.0235335573. The cubic root of 31461145 is about 315.6880734648.

Adding to 31461145 its reverse (54116413), we get a palindrome (85577558).

The spelling of 31461145 in words is "thirty-one million, four hundred sixty-one thousand, one hundred forty-five".