1970131657 has 4 divisors (see below), whose sum is σ = 2121680260. Its totient is φ = 1818583056.

The previous prime is 1970131619. The next prime is 1970131661. The reversal of 1970131657 is 7561310791.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 236575161 + 1733556496 = 15381^2 + 41636^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1970131657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1970131697) 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, 75774282 + ... + 75774307.

It is an arithmetic number, because the mean of its divisors is an integer number (530420065).

Almost surely, 2^1970131657 is an apocalyptic number.

It is an amenable number.

1970131657 is a deficient number, since it is larger than the sum of its proper divisors (151548603).

1970131657 is a wasteful number, since it uses less digits than its factorization.

1970131657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151548602.

The product of its (nonzero) digits is 39690, while the sum is 40.

The square root of 1970131657 is about 44386.1651531195. The cubic root of 1970131657 is about 1253.6176070619.

The spelling of 1970131657 in words is "one billion, nine hundred seventy million, one hundred thirty-one thousand, six hundred fifty-seven".