231778398761 has 8 divisors (see below), whose sum is σ = 285265721664. Its totient is φ = 183385106640.

The previous prime is 231778398743. The next prime is 231778398763. The reversal of 231778398761 is 167893877132.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231778398761 is a prime.

It is a super-2 number, since 2×231778398761² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231778398694 and 231778398703.

It is not an unprimeable number, because it can be changed into a prime (231778398763) 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, 1273507595 + ... + 1273507776.

It is an arithmetic number, because the mean of its divisors is an integer number (35658215208).

Almost surely, 2^231778398761 is an apocalyptic number.

It is an amenable number.

231778398761 is a deficient number, since it is larger than the sum of its proper divisors (53487322903).

231778398761 is a wasteful number, since it uses less digits than its factorization.

231778398761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2547015391.

The product of its digits is 21337344, while the sum is 62.

The spelling of 231778398761 in words is "two hundred thirty-one billion, seven hundred seventy-eight million, three hundred ninety-eight thousand, seven hundred sixty-one".