902497861 has 4 divisors (see below), whose sum is σ = 902623500. Its totient is φ = 902372224.

The previous prime is 902497837. The next prime is 902497879. The reversal of 902497861 is 168794209.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 145202500 + 757295361 = 12050^2 + 27519^2 .

It is a cyclic number.

It is not a de Polignac number, because 902497861 - 2⁷ = 902497733 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 (902497801) 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, 51346 + ... + 66643.

It is an arithmetic number, because the mean of its divisors is an integer number (225655875).

Almost surely, 2^902497861 is an apocalyptic number.

It is an amenable number.

902497861 is a deficient number, since it is larger than the sum of its proper divisors (125639).

902497861 is a wasteful number, since it uses less digits than its factorization.

902497861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125638.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 902497861 is about 30041.6021709895. The cubic root of 902497861 is about 966.3817663120.

The spelling of 902497861 in words is "nine hundred two million, four hundred ninety-seven thousand, eight hundred sixty-one".