61761531 has 8 divisors (see below), whose sum is σ = 88683280. Its totient is φ = 38007072.

The previous prime is 61761523. The next prime is 61761541. The reversal of 61761531 is 13516716.

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

It is not a de Polignac number, because 61761531 - 2³ = 61761523 is a prime.

It is a super-2 number, since 2×61761531² = 7628973422927922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61761521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 791776 + ... + 791853.

It is an arithmetic number, because the mean of its divisors is an integer number (11085410).

Almost surely, 2^61761531 is an apocalyptic number.

61761531 is a deficient number, since it is larger than the sum of its proper divisors (26921749).

61761531 is a wasteful number, since it uses less digits than its factorization.

61761531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583645.

The product of its digits is 3780, while the sum is 30.

The square root of 61761531 is about 7858.8504884620. The cubic root of 61761531 is about 395.2810711139.

The spelling of 61761531 in words is "sixty-one million, seven hundred sixty-one thousand, five hundred thirty-one".