61421139 has 16 divisors (see below), whose sum is σ = 97994400. Its totient is φ = 37797408.

The previous prime is 61421123. The next prime is 61421179. The reversal of 61421139 is 93112416.

61421139 is a `hidden beast` number, since 614 + 2 + 11 + 39 = 666.

It is not a de Polignac number, because 61421139 - 2⁴ = 61421123 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (61421179) 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, 87144 + ... + 87845.

It is an arithmetic number, because the mean of its divisors is an integer number (6124650).

Almost surely, 2^61421139 is an apocalyptic number.

61421139 is a deficient number, since it is larger than the sum of its proper divisors (36573261).

61421139 is a wasteful number, since it uses less digits than its factorization.

61421139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175011 (or 175005 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 61421139 is about 7837.1639640880. The cubic root of 61421139 is about 394.5535499601.

The spelling of 61421139 in words is "sixty-one million, four hundred twenty-one thousand, one hundred thirty-nine".