102431491 has 2 divisors, whose sum is σ = 102431492. Its totient is φ = 102431490.

The previous prime is 102431467. The next prime is 102431513. The reversal of 102431491 is 194134201.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (194134201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102431491 - 2⁷ = 102431363 is a prime.

It is not a weakly prime, because it can be changed into another prime (102431401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51215745 + 51215746.

It is an arithmetic number, because the mean of its divisors is an integer number (51215746).

Almost surely, 2^102431491 is an apocalyptic number.

102431491 is a deficient number, since it is larger than the sum of its proper divisors (1).

102431491 is an equidigital number, since it uses as much as digits as its factorization.

102431491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 102431491 is about 10120.8443817697. The cubic root of 102431491 is about 467.8907916584.

Adding to 102431491 its reverse (194134201), we get a palindrome (296565692).

The spelling of 102431491 in words is "one hundred two million, four hundred thirty-one thousand, four hundred ninety-one".