61381579431 has 16 divisors (see below), whose sum is σ = 86711620608. Its totient is φ = 38489366400.

The previous prime is 61381579409. The next prime is 61381579451. The reversal of 61381579431 is 13497518316.

It is not a de Polignac number, because 61381579431 - 2⁹ = 61381578919 is a prime.

It is a super-2 number, since 2×61381579431² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61381579451) 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, 302935 + ... + 463176.

It is an arithmetic number, because the mean of its divisors is an integer number (5419476288).

Almost surely, 2^61381579431 is an apocalyptic number.

61381579431 is a deficient number, since it is larger than the sum of its proper divisors (25330041177).

61381579431 is a wasteful number, since it uses less digits than its factorization.

61381579431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767702.

The product of its digits is 544320, while the sum is 48.

The spelling of 61381579431 in words is "sixty-one billion, three hundred eighty-one million, five hundred seventy-nine thousand, four hundred thirty-one".