10402591 has 4 divisors (see below), whose sum is σ = 10429192. Its totient is φ = 10375992.

The previous prime is 10402583. The next prime is 10402607. The reversal of 10402591 is 19520401.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19520401 = 271 ⋅72031.

It is not a de Polignac number, because 10402591 - 2³ = 10402583 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 (10402501) 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, 12705 + ... + 13498.

It is an arithmetic number, because the mean of its divisors is an integer number (2607298).

Almost surely, 2^10402591 is an apocalyptic number.

10402591 is a deficient number, since it is larger than the sum of its proper divisors (26601).

10402591 is an equidigital number, since it uses as much as digits as its factorization.

10402591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26600.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 10402591 is about 3225.3047917988. The cubic root of 10402591 is about 218.2967020235.

Adding to 10402591 its reverse (19520401), we get a palindrome (29922992).

The spelling of 10402591 in words is "ten million, four hundred two thousand, five hundred ninety-one".