1157624729 has 4 divisors (see below), whose sum is σ = 1173482676. Its totient is φ = 1141766784.

The previous prime is 1157624717. The next prime is 1157624747. The reversal of 1157624729 is 9274267511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9274267511 = 139 ⋅66721349.

It can be written as a sum of positive squares in 2 ways, for example, as 382280704 + 775344025 = 19552^2 + 27845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1157624729 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1157624729.

It is not an unprimeable number, because it can be changed into a prime (1157624759) 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, 7928864 + ... + 7929009.

It is an arithmetic number, because the mean of its divisors is an integer number (293370669).

Almost surely, 2^1157624729 is an apocalyptic number.

It is an amenable number.

1157624729 is a deficient number, since it is larger than the sum of its proper divisors (15857947).

1157624729 is an equidigital number, since it uses as much as digits as its factorization.

1157624729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15857946.

The product of its digits is 211680, while the sum is 44.

The square root of 1157624729 is about 34023.8846841450. The cubic root of 1157624729 is about 1049.9999180650. Note that the first 4 decimals are identical.

The spelling of 1157624729 in words is "one billion, one hundred fifty-seven million, six hundred twenty-four thousand, seven hundred twenty-nine".