1156397263 has 6 divisors (see below), whose sum is σ = 1321699704. Its totient is φ = 991120536.

The previous prime is 1156397261. The next prime is 1156397267. The reversal of 1156397263 is 3627936511.

It is not a de Polignac number, because 1156397263 - 2¹ = 1156397261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156397261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 83545 + ... + 96397.

It is an arithmetic number, because the mean of its divisors is an integer number (220283284).

Almost surely, 2^1156397263 is an apocalyptic number.

1156397263 is a deficient number, since it is larger than the sum of its proper divisors (165302441).

1156397263 is an frugal number, since it uses more digits than its factorization.

1156397263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25713 (or 12860 counting only the distinct ones).

The product of its digits is 204120, while the sum is 43.

The square root of 1156397263 is about 34005.8416011132. The cubic root of 1156397263 is about 1049.6286708125.

The spelling of 1156397263 in words is "one billion, one hundred fifty-six million, three hundred ninety-seven thousand, two hundred sixty-three".