61807531 has 2 divisors, whose sum is σ = 61807532. Its totient is φ = 61807530.

The previous prime is 61807517. The next prime is 61807547. The reversal of 61807531 is 13570816.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61807531 - 2²¹ = 59710379 is a prime.

It is a super-2 number, since 2×61807531² = 7640341776631922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 61807493 and 61807502.

It is not a weakly prime, because it can be changed into another prime (61807511) 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 as a sum of consecutive naturals, namely, 30903765 + 30903766.

It is an arithmetic number, because the mean of its divisors is an integer number (30903766).

Almost surely, 2^61807531 is an apocalyptic number.

61807531 is a deficient number, since it is larger than the sum of its proper divisors (1).

61807531 is an equidigital number, since it uses as much as digits as its factorization.

61807531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 61807531 is about 7861.7765803920. The cubic root of 61807531 is about 395.3791818992.

The spelling of 61807531 in words is "sixty-one million, eight hundred seven thousand, five hundred thirty-one".