1295775921 has 16 divisors (see below), whose sum is σ = 1995634368. Its totient is φ = 739123200.

The previous prime is 1295775919. The next prime is 1295775937.

It is a happy number.

1295775921 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1295775921 - 2¹ = 1295775919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1295775991) 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, 1154320 + ... + 1155441.

It is an arithmetic number, because the mean of its divisors is an integer number (124727148).

Almost surely, 2^1295775921 is an apocalyptic number.

1295775921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1295775921 is a deficient number, since it is larger than the sum of its proper divisors (699858447).

1295775921 is a wasteful number, since it uses less digits than its factorization.

1295775921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2309792.

The product of its digits is 396900, while the sum is 48.

The square root of 1295775921 is about 35996.8876571295. The cubic root of 1295775921 is about 1090.2095158791.

The spelling of 1295775921 in words is "one billion, two hundred ninety-five million, seven hundred seventy-five thousand, nine hundred twenty-one".