61401881 has 16 divisors (see below), whose sum is σ = 66355200. Its totient is φ = 56676048.

The previous prime is 61401853. The next prime is 61401913. The reversal of 61401881 is 18810416.

It is not a de Polignac number, because 61401881 - 2⁶ = 61401817 is a prime.

It is a super-2 number, since 2×61401881² = 7540381980676322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61401811) 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, 85040 + ... + 85758.

It is an arithmetic number, because the mean of its divisors is an integer number (4147200).

Almost surely, 2^61401881 is an apocalyptic number.

It is an amenable number.

61401881 is a deficient number, since it is larger than the sum of its proper divisors (4953319).

61401881 is a wasteful number, since it uses less digits than its factorization.

61401881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868.

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 61401881 is about 7835.9352345460. The cubic root of 61401881 is about 394.5123095085.

The spelling of 61401881 in words is "sixty-one million, four hundred one thousand, eight hundred eighty-one".