172241065257491 has 16 divisors (see below), whose sum is σ = 183210198620160. Its totient is φ = 161589586672800.

The previous prime is 172241065257473. The next prime is 172241065257529. The reversal of 172241065257491 is 194752560142271.

It is a cyclic number.

It is not a de Polignac number, because 172241065257491 - 2¹⁸ = 172241064995347 is a prime.

It is a super-2 number, since 2×172241065257491² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172241065257421) 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, 313613720 + ... + 314162453.

It is an arithmetic number, because the mean of its divisors is an integer number (11450637413760).

Almost surely, 2^{172241065257491} is an apocalyptic number.

172241065257491 is a deficient number, since it is larger than the sum of its proper divisors (10969133362669).

172241065257491 is a wasteful number, since it uses less digits than its factorization.

172241065257491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627776426.

The product of its (nonzero) digits is 8467200, while the sum is 56.

The spelling of 172241065257491 in words is "one hundred seventy-two trillion, two hundred forty-one billion, sixty-five million, two hundred fifty-seven thousand, four hundred ninety-one".