1297121958 has 32 divisors (see below), whose sum is σ = 3144539520. Its totient is φ = 393067080.

The previous prime is 1297121957. The next prime is 1297121983. The reversal of 1297121958 is 8591217921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1297121953) 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, 1091260 + ... + 1092447.

It is an arithmetic number, because the mean of its divisors is an integer number (98266860).

Almost surely, 2^1297121958 is an apocalyptic number.

1297121958 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1297121958 is an abundant number, since it is smaller than the sum of its proper divisors (1847417562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1297121958 is a wasteful number, since it uses less digits than its factorization.

1297121958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2183729 (or 2183723 counting only the distinct ones).

The product of its digits is 90720, while the sum is 45.

The square root of 1297121958 is about 36015.5793789299. The cubic root of 1297121958 is about 1090.5868842414.

The spelling of 1297121958 in words is "one billion, two hundred ninety-seven million, one hundred twenty-one thousand, nine hundred fifty-eight".