1497557923 has 4 divisors (see below), whose sum is σ = 1534083768. Its totient is φ = 1461032080.

The previous prime is 1497557911. The next prime is 1497557927. The reversal of 1497557923 is 3297557941.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1497557923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1497557927) 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, 18262861 + ... + 18262942.

It is an arithmetic number, because the mean of its divisors is an integer number (383520942).

Almost surely, 2^1497557923 is an apocalyptic number.

1497557923 is a deficient number, since it is larger than the sum of its proper divisors (36525845).

1497557923 is an equidigital number, since it uses as much as digits as its factorization.

1497557923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36525844.

The product of its digits is 2381400, while the sum is 52.

The square root of 1497557923 is about 38698.2935411886. The cubic root of 1497557923 is about 1144.0926872736.

The spelling of 1497557923 in words is "one billion, four hundred ninety-seven million, five hundred fifty-seven thousand, nine hundred twenty-three".