61405544031 has 16 divisors (see below), whose sum is σ = 91016325120. Its totient is φ = 36569057760.

The previous prime is 61405544021. The next prime is 61405544051. The reversal of 61405544031 is 13044550416.

It is not a de Polignac number, because 61405544031 - 2⁵ = 61405543999 is a prime.

It is a super-2 number, since 2×61405544031² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61405543983 and 61405544001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61405544021) 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, 25393971 + ... + 25396388.

It is an arithmetic number, because the mean of its divisors is an integer number (5688520320).

Almost surely, 2^61405544031 is an apocalyptic number.

61405544031 is a deficient number, since it is larger than the sum of its proper divisors (29610781089).

61405544031 is a wasteful number, since it uses less digits than its factorization.

61405544031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50790406.

The product of its (nonzero) digits is 28800, while the sum is 33.

The spelling of 61405544031 in words is "sixty-one billion, four hundred five million, five hundred forty-four thousand, thirty-one".