87404431 has 2 divisors, whose sum is σ = 87404432. Its totient is φ = 87404430.

The previous prime is 87404419. The next prime is 87404437. The reversal of 87404431 is 13440478.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87404431 - 2²¹ = 85307279 is a prime.

It is a super-2 number, since 2×87404431² = 15279069116867522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 87404393 and 87404402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87404437) 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, 43702215 + 43702216.

It is an arithmetic number, because the mean of its divisors is an integer number (43702216).

Almost surely, 2^87404431 is an apocalyptic number.

87404431 is a deficient number, since it is larger than the sum of its proper divisors (1).

87404431 is an equidigital number, since it uses as much as digits as its factorization.

87404431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 87404431 is about 9349.0336933824. The cubic root of 87404431 is about 443.7903113283.

The spelling of 87404431 in words is "eighty-seven million, four hundred four thousand, four hundred thirty-one".