1597997951 has 16 divisors (see below), whose sum is σ = 1805303808. Its totient is φ = 1401333600.

The previous prime is 1597997941. The next prime is 1597997969.

1597997951 is nontrivially palindromic in base 10.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1597997951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1597997941) 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, 100706 + ... + 115488.

It is an arithmetic number, because the mean of its divisors is an integer number (112831488).

Almost surely, 2^1597997951 is an apocalyptic number.

1597997951 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1597997951 is a deficient number, since it is larger than the sum of its proper divisors (207305857).

1597997951 is a wasteful number, since it uses less digits than its factorization.

1597997951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15142.

The product of its digits is 8037225, while the sum is 62.

The square root of 1597997951 is about 39974.9665540823. The cubic root of 1597997951 is about 1169.1190561048.

The spelling of 1597997951 in words is "one billion, five hundred ninety-seven million, nine hundred ninety-seven thousand, nine hundred fifty-one".