102015491 has 2 divisors, whose sum is σ = 102015492. Its totient is φ = 102015490.

The previous prime is 102015467. The next prime is 102015493. The reversal of 102015491 is 194510201.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102015491 is a prime.

Together with 102015493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (102015493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51007745 + 51007746.

It is an arithmetic number, because the mean of its divisors is an integer number (51007746).

Almost surely, 2^102015491 is an apocalyptic number.

102015491 is a deficient number, since it is larger than the sum of its proper divisors (1).

102015491 is an equidigital number, since it uses as much as digits as its factorization.

102015491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 102015491 is about 10100.2718280252. The cubic root of 102015491 is about 467.2565249207.

Adding to 102015491 its reverse (194510201), we get a palindrome (296525692).

The spelling of 102015491 in words is "one hundred two million, fifteen thousand, four hundred ninety-one".