1154402721 has 6 divisors (see below), whose sum is σ = 1667470610. Its totient is φ = 769601808.

The previous prime is 1154402693. The next prime is 1154402737. The reversal of 1154402721 is 1272044511.

It can be written as a sum of positive squares in only one way, i.e., 1096338321 + 58064400 = 33111^2 + 7620^2 .

It is not a de Polignac number, because 1154402721 - 2¹³ = 1154394529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1154402021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64133476 + ... + 64133493.

Almost surely, 2^1154402721 is an apocalyptic number.

It is an amenable number.

1154402721 is a deficient number, since it is larger than the sum of its proper divisors (513067889).

1154402721 is a wasteful number, since it uses less digits than its factorization.

1154402721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128266975 (or 128266972 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 1154402721 is about 33976.5024833340. The cubic root of 1154402721 is about 1049.0248606508.

The spelling of 1154402721 in words is "one billion, one hundred fifty-four million, four hundred two thousand, seven hundred twenty-one".