61917431 has 2 divisors, whose sum is σ = 61917432. Its totient is φ = 61917430.

The previous prime is 61917367. The next prime is 61917437. The reversal of 61917431 is 13471916.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61917431 - 2⁶ = 61917367 is a prime.

It is a super-2 number, since 2×61917431² = 7667536523279522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61917437) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30958715 + 30958716.

It is an arithmetic number, because the mean of its divisors is an integer number (30958716).

Almost surely, 2^61917431 is an apocalyptic number.

61917431 is a deficient number, since it is larger than the sum of its proper divisors (1).

61917431 is an equidigital number, since it uses as much as digits as its factorization.

61917431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 32.

The square root of 61917431 is about 7868.7629904579. The cubic root of 61917431 is about 395.6133844453.

The spelling of 61917431 in words is "sixty-one million, nine hundred seventeen thousand, four hundred thirty-one".