1971261914957 has 16 divisors (see below), whose sum is σ = 2103551553600. Its totient is φ = 1841978620800.

The previous prime is 1971261914953. The next prime is 1971261914969. The reversal of 1971261914957 is 7594191621791.

It is not a de Polignac number, because 1971261914957 - 2² = 1971261914953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1971261914957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971261914953) 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, 1651544 + ... + 2582657.

It is an arithmetic number, because the mean of its divisors is an integer number (131471972100).

Almost surely, 2^{1971261914957} is an apocalyptic number.

It is an amenable number.

1971261914957 is a deficient number, since it is larger than the sum of its proper divisors (132289638643).

1971261914957 is a wasteful number, since it uses less digits than its factorization.

1971261914957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4234556.

The product of its digits is 8573040, while the sum is 62.

The spelling of 1971261914957 in words is "one trillion, nine hundred seventy-one billion, two hundred sixty-one million, nine hundred fourteen thousand, nine hundred fifty-seven".