1979455251 has 16 divisors (see below), whose sum is σ = 2688134400. Its totient is φ = 1295275488.

The previous prime is 1979455241. The next prime is 1979455271. The reversal of 1979455251 is 1525549791.

It is not a de Polignac number, because 1979455251 - 2⁷ = 1979455123 is a prime.

It is a super-2 number, since 2×1979455251² = 7836486181422946002, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1979455251.

It is not an unprimeable number, because it can be changed into a prime (1979455241) 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, 111570 + ... + 128088.

It is an arithmetic number, because the mean of its divisors is an integer number (168008400).

Almost surely, 2^1979455251 is an apocalyptic number.

1979455251 is a deficient number, since it is larger than the sum of its proper divisors (708679149).

1979455251 is a wasteful number, since it uses less digits than its factorization.

1979455251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17258.

The product of its digits is 567000, while the sum is 48.

The square root of 1979455251 is about 44491.0693398125. The cubic root of 1979455251 is about 1255.5920659464.

The spelling of 1979455251 in words is "one billion, nine hundred seventy-nine million, four hundred fifty-five thousand, two hundred fifty-one".