61100431431 has 16 divisors (see below), whose sum is σ = 91548473856. Its totient is φ = 35965470816.

The previous prime is 61100431373. The next prime is 61100431433. The reversal of 61100431431 is 13413400116.

It is not a de Polignac number, because 61100431431 - 2¹⁰ = 61100430407 is a prime.

It is a super-2 number, since 2×61100431431² (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 (61100431433) 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, 34057315 + ... + 34059108.

It is an arithmetic number, because the mean of its divisors is an integer number (5721779616).

Almost surely, 2^61100431431 is an apocalyptic number.

61100431431 is a deficient number, since it is larger than the sum of its proper divisors (30448042425).

61100431431 is a wasteful number, since it uses less digits than its factorization.

61100431431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68116462.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 61100431431 its reverse (13413400116), we get a palindrome (74513831547).

The spelling of 61100431431 in words is "sixty-one billion, one hundred million, four hundred thirty-one thousand, four hundred thirty-one".