61517227431 has 8 divisors (see below), whose sum is σ = 89479603584. Its totient is φ = 37283168120.

The previous prime is 61517227411. The next prime is 61517227441. The reversal of 61517227431 is 13472271516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61517227431 - 2³⁰ = 60443485607 is a prime.

It is a super-2 number, since 2×61517227431² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61517227431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61517227411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 932079171 + ... + 932079236.

It is an arithmetic number, because the mean of its divisors is an integer number (11184950448).

Almost surely, 2^61517227431 is an apocalyptic number.

61517227431 is a deficient number, since it is larger than the sum of its proper divisors (27962376153).

61517227431 is a wasteful number, since it uses less digits than its factorization.

61517227431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1864158421.

The product of its digits is 70560, while the sum is 39.

Adding to 61517227431 its reverse (13472271516), we get a palindrome (74989498947).

The spelling of 61517227431 in words is "sixty-one billion, five hundred seventeen million, two hundred twenty-seven thousand, four hundred thirty-one".