61256531 has 4 divisors (see below), whose sum is σ = 70007472. Its totient is φ = 52505592.

The previous prime is 61256519. The next prime is 61256561. The reversal of 61256531 is 13565216.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61256531 - 2¹⁰ = 61255507 is a prime.

It is a super-2 number, since 2×61256531² = 7504725180307922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61256494 and 61256503.

It is not an unprimeable number, because it can be changed into a prime (61256561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4375460 + ... + 4375473.

It is an arithmetic number, because the mean of its divisors is an integer number (17501868).

Almost surely, 2^61256531 is an apocalyptic number.

61256531 is a deficient number, since it is larger than the sum of its proper divisors (8750941).

61256531 is an equidigital number, since it uses as much as digits as its factorization.

61256531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8750940.

The product of its digits is 5400, while the sum is 29.

The square root of 61256531 is about 7826.6551604118. The cubic root of 61256531 is about 394.2007681810.

The spelling of 61256531 in words is "sixty-one million, two hundred fifty-six thousand, five hundred thirty-one".