1551117957 has 4 divisors (see below), whose sum is σ = 2068157280. Its totient is φ = 1034078636.

The previous prime is 1551117913. The next prime is 1551117977. The reversal of 1551117957 is 7597111551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1551117957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551117977) 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, 258519657 + ... + 258519662.

It is an arithmetic number, because the mean of its divisors is an integer number (517039320).

Almost surely, 2^1551117957 is an apocalyptic number.

It is an amenable number.

1551117957 is a deficient number, since it is larger than the sum of its proper divisors (517039323).

1551117957 is an equidigital number, since it uses as much as digits as its factorization.

1551117957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517039322.

The product of its digits is 55125, while the sum is 42.

The square root of 1551117957 is about 39384.2348789462. The cubic root of 1551117957 is about 1157.5726981413.

The spelling of 1551117957 in words is "one billion, five hundred fifty-one million, one hundred seventeen thousand, nine hundred fifty-seven".