1156257005 has 4 divisors (see below), whose sum is σ = 1387508412. Its totient is φ = 925005600.

The previous prime is 1156256977. The next prime is 1156257049. The reversal of 1156257005 is 5007526511.

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

It can be written as a sum of positive squares in 2 ways, for example, as 189420169 + 966836836 = 13763^2 + 31094^2 .

It is not a de Polignac number, because 1156257005 - 2⁸ = 1156256749 is a prime.

It is a super-2 number, since 2×1156257005² = 2673860523223140050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115625696 + ... + 115625705.

It is an arithmetic number, because the mean of its divisors is an integer number (346877103).

Almost surely, 2^1156257005 is an apocalyptic number.

It is an amenable number.

1156257005 is a deficient number, since it is larger than the sum of its proper divisors (231251407).

1156257005 is an equidigital number, since it uses as much as digits as its factorization.

1156257005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231251406.

The product of its (nonzero) digits is 10500, while the sum is 32.

The square root of 1156257005 is about 34003.7792752512. The cubic root of 1156257005 is about 1049.5862330404.

The spelling of 1156257005 in words is "one billion, one hundred fifty-six million, two hundred fifty-seven thousand, five".