61921587 has 16 divisors (see below), whose sum is σ = 101615360. Its totient is φ = 32661792.

The previous prime is 61921577. The next prime is 61921597. The reversal of 61921587 is 78512916.

It is an interprime number because it is at equal distance from previous prime (61921577) and next prime (61921597).

It is not a de Polignac number, because 61921587 - 2⁴ = 61921571 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (61921547) 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, 113137 + ... + 113682.

It is an arithmetic number, because the mean of its divisors is an integer number (6350960).

Almost surely, 2^61921587 is an apocalyptic number.

61921587 is a deficient number, since it is larger than the sum of its proper divisors (39693773).

61921587 is a wasteful number, since it uses less digits than its factorization.

61921587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226842.

The product of its digits is 30240, while the sum is 39.

The square root of 61921587 is about 7869.0270681959. The cubic root of 61921587 is about 395.6222356547.

The spelling of 61921587 in words is "sixty-one million, nine hundred twenty-one thousand, five hundred eighty-seven".