191481544631 has 8 divisors (see below), whose sum is σ = 209705994960. Its totient is φ = 173756394432.

The previous prime is 191481544619. The next prime is 191481544633. The reversal of 191481544631 is 136445184191.

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

It is a cyclic number.

It is not a de Polignac number, because 191481544631 - 2¹⁴ = 191481528247 is a prime.

It is a super-2 number, since 2×191481544631² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191481544633) 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, 124824230 + ... + 124825763.

It is an arithmetic number, because the mean of its divisors is an integer number (26213249370).

Almost surely, 2^191481544631 is an apocalyptic number.

191481544631 is a deficient number, since it is larger than the sum of its proper divisors (18224450329).

191481544631 is a wasteful number, since it uses less digits than its factorization.

191481544631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249650065.

The product of its digits is 414720, while the sum is 47.

The spelling of 191481544631 in words is "one hundred ninety-one billion, four hundred eighty-one million, five hundred forty-four thousand, six hundred thirty-one".