97144387957 has 4 divisors (see below), whose sum is σ = 97145027500. Its totient is φ = 97143748416.

The previous prime is 97144387939. The next prime is 97144387981. The reversal of 97144387957 is 75978344179.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75978344179 = 67 ⋅1134005137.

It can be written as a sum of positive squares in 2 ways, for example, as 51080068081 + 46064319876 = 226009^2 + 214626^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97144387957 is a prime.

It is a super-2 number, since 2×97144387957² (a number of 23 digits) contains 22 as substring.

It is a deceptive number, since it divides R_97144387956.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97144387927) 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, 52669 + ... + 443917.

It is an arithmetic number, because the mean of its divisors is an integer number (24286256875).

Almost surely, 2^97144387957 is an apocalyptic number.

97144387957 is the 179949-th hex number.

It is an amenable number.

97144387957 is a deficient number, since it is larger than the sum of its proper divisors (639543).

97144387957 is a wasteful number, since it uses less digits than its factorization.

97144387957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639542.

The product of its digits is 53343360, while the sum is 64.

The spelling of 97144387957 in words is "ninety-seven billion, one hundred forty-four million, three hundred eighty-seven thousand, nine hundred fifty-seven".