1253001561 has 8 divisors (see below), whose sum is σ = 1909335744. Its totient is φ = 716000880.

The previous prime is 1253001527. The next prime is 1253001583. The reversal of 1253001561 is 1651003521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1253001561 - 2⁷ = 1253001433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1253001511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29833350 + ... + 29833391.

It is an arithmetic number, because the mean of its divisors is an integer number (238666968).

Almost surely, 2^1253001561 is an apocalyptic number.

It is an amenable number.

1253001561 is a deficient number, since it is larger than the sum of its proper divisors (656334183).

1253001561 is an equidigital number, since it uses as much as digits as its factorization.

1253001561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59666751.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 1253001561 is about 35397.7620902791. The cubic root of 1253001561 is about 1078.0788780841.

The spelling of 1253001561 in words is "one billion, two hundred fifty-three million, one thousand, five hundred sixty-one".