61555371 has 16 divisors (see below), whose sum is σ = 85190400. Its totient is φ = 39488288.

The previous prime is 61555343. The next prime is 61555381. The reversal of 61555371 is 17355516.

It is a cyclic number.

It is not a de Polignac number, because 61555371 - 2¹⁴ = 61538987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61555331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29170 + ... + 31208.

It is an arithmetic number, because the mean of its divisors is an integer number (5324400).

Almost surely, 2^61555371 is an apocalyptic number.

61555371 is a deficient number, since it is larger than the sum of its proper divisors (23635029).

61555371 is a wasteful number, since it uses less digits than its factorization.

61555371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2418.

The product of its digits is 15750, while the sum is 33.

The square root of 61555371 is about 7845.7231024298. The cubic root of 61555371 is about 394.8407647435.

The spelling of 61555371 in words is "sixty-one million, five hundred fifty-five thousand, three hundred seventy-one".