191405537492 has 24 divisors (see below), whose sum is σ = 373164645000. Its totient is φ = 85294774656.

The previous prime is 191405537459. The next prime is 191405537497. The reversal of 191405537492 is 294735504191.

It can be written as a sum of positive squares in 4 ways, for example, as 13223620036 + 178181917456 = 114994^2 + 422116^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 191405537492.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191405537497) 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, 63461867 + ... + 63464882.

It is an arithmetic number, because the mean of its divisors is an integer number (15548526875).

Almost surely, 2^191405537492 is an apocalyptic number.

It is an amenable number.

191405537492 is a deficient number, since it is larger than the sum of its proper divisors (181759107508).

191405537492 is a wasteful number, since it uses less digits than its factorization.

191405537492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126926795 (or 126926793 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 50.

The spelling of 191405537492 in words is "one hundred ninety-one billion, four hundred five million, five hundred thirty-seven thousand, four hundred ninety-two".