61263431 has 2 divisors, whose sum is σ = 61263432. Its totient is φ = 61263430.

The previous prime is 61263373. The next prime is 61263437. The reversal of 61263431 is 13436216.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61263431 is a prime.

It is a super-2 number, since 2×61263431² = 7506415955783522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61263431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61263437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30631715 + 30631716.

It is an arithmetic number, because the mean of its divisors is an integer number (30631716).

Almost surely, 2^61263431 is an apocalyptic number.

61263431 is a deficient number, since it is larger than the sum of its proper divisors (1).

61263431 is an equidigital number, since it uses as much as digits as its factorization.

61263431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 26.

The square root of 61263431 is about 7827.0959493288. The cubic root of 61263431 is about 394.2155686881.

Adding to 61263431 its reverse (13436216), we get a palindrome (74699647).

The spelling of 61263431 in words is "sixty-one million, two hundred sixty-three thousand, four hundred thirty-one".