97511241691 has 4 divisors (see below), whose sum is σ = 97511904112. Its totient is φ = 97510579272.

The previous prime is 97511241679. The next prime is 97511241713. The reversal of 97511241691 is 19614211579.

97511241691 is a nontrivial binomial coefficient, being equal to C(441614, 2).

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a 3-Lehmer number, since φ(97511241691) divides (97511241691-1)³.

It is a cyclic number.

It is not a de Polignac number, because 97511241691 - 2⁷ = 97511241563 is a prime.

It is a super-2 number, since 2×97511241691² (a number of 23 digits) contains 22 as substring.

It is a deceptive number, since it divides R_97511241690.

It is not an unprimeable number, because it can be changed into a prime (97511242691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1 + ... + 441613.

It is an arithmetic number, because the mean of its divisors is an integer number (24377976028).

Almost surely, 2^97511241691 is an apocalyptic number.

97511241691 is the 441613-rd triangular number and also the 220807-th hexagonal number.

97511241691 is the 147205-th centered nonagonal number.

97511241691 is a deficient number, since it is larger than the sum of its proper divisors (662421).

97511241691 is a wasteful number, since it uses less digits than its factorization.

97511241691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662420.

The product of its digits is 136080, while the sum is 46.

The spelling of 97511241691 in words is "ninety-seven billion, five hundred eleven million, two hundred forty-one thousand, six hundred ninety-one".