1957192121 has 2 divisors, whose sum is σ = 1957192122. Its totient is φ = 1957192120.

The previous prime is 1957192079. The next prime is 1957192129. The reversal of 1957192121 is 1212917591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1000836496 + 956355625 = 31636^2 + 30925^2 .

It is a cyclic number.

It is not a de Polignac number, because 1957192121 - 2¹⁸ = 1956929977 is a prime.

It is not a weakly prime, because it can be changed into another prime (1957192129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 978596060 + 978596061.

It is an arithmetic number, because the mean of its divisors is an integer number (978596061).

Almost surely, 2^1957192121 is an apocalyptic number.

It is an amenable number.

1957192121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1957192121 is an equidigital number, since it uses as much as digits as its factorization.

1957192121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11340, while the sum is 38.

The square root of 1957192121 is about 44240.1641158800. The cubic root of 1957192121 is about 1250.8670509191.

The spelling of 1957192121 in words is "one billion, nine hundred fifty-seven million, one hundred ninety-two thousand, one hundred twenty-one".