102631591 has 4 divisors (see below), whose sum is σ = 102729384. Its totient is φ = 102533800.

The previous prime is 102631577. The next prime is 102631631. The reversal of 102631591 is 195136201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 195136201 = 13 ⋅15010477.

It is a cyclic number.

It is not a de Polignac number, because 102631591 - 2⁹ = 102631079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102631531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47305 + ... + 49426.

It is an arithmetic number, because the mean of its divisors is an integer number (25682346).

Almost surely, 2^102631591 is an apocalyptic number.

102631591 is a deficient number, since it is larger than the sum of its proper divisors (97793).

102631591 is an equidigital number, since it uses as much as digits as its factorization.

102631591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97792.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 102631591 is about 10130.7250974449. The cubic root of 102631591 is about 468.1952684916.

Adding to 102631591 its reverse (195136201), we get a palindrome (297767792).

The spelling of 102631591 in words is "one hundred two million, six hundred thirty-one thousand, five hundred ninety-one".