102521431 has 2 divisors, whose sum is σ = 102521432. Its totient is φ = 102521430.

The previous prime is 102521411. The next prime is 102521449. The reversal of 102521431 is 134125201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 102521431 - 2⁷ = 102521303 is a prime.

It is a super-2 number, since 2×102521431² = 21021287628575522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 102521399 and 102521408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102521411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51260715 + 51260716.

It is an arithmetic number, because the mean of its divisors is an integer number (51260716).

Almost surely, 2^102521431 is an apocalyptic number.

102521431 is a deficient number, since it is larger than the sum of its proper divisors (1).

102521431 is an equidigital number, since it uses as much as digits as its factorization.

102521431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 102521431 is about 10125.2867119899. The cubic root of 102521431 is about 468.0276954779.

Adding to 102521431 its reverse (134125201), we get a palindrome (236646632).

The spelling of 102521431 in words is "one hundred two million, five hundred twenty-one thousand, four hundred thirty-one".