61902391 has 4 divisors (see below), whose sum is σ = 62273232. Its totient is φ = 61531552.

The previous prime is 61902383. The next prime is 61902397. The reversal of 61902391 is 19320916.

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

It is a cyclic number.

It is not a de Polignac number, because 61902391 - 2³ = 61902383 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 (61902397) 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, 185170 + ... + 185503.

It is an arithmetic number, because the mean of its divisors is an integer number (15568308).

Almost surely, 2^61902391 is an apocalyptic number.

61902391 is a deficient number, since it is larger than the sum of its proper divisors (370841).

61902391 is a wasteful number, since it uses less digits than its factorization.

61902391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370840.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 61902391 is about 7867.8072548837. The cubic root of 61902391 is about 395.5813498091.

The spelling of 61902391 in words is "sixty-one million, nine hundred two thousand, three hundred ninety-one".