1292601561 has 4 divisors (see below), whose sum is σ = 1723468752. Its totient is φ = 861734372.

The previous prime is 1292601553. The next prime is 1292601617. The reversal of 1292601561 is 1651062921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1292601561 - 2³ = 1292601553 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1292601161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215433591 + ... + 215433596.

It is an arithmetic number, because the mean of its divisors is an integer number (430867188).

Almost surely, 2^1292601561 is an apocalyptic number.

It is an amenable number.

1292601561 is a deficient number, since it is larger than the sum of its proper divisors (430867191).

1292601561 is an equidigital number, since it uses as much as digits as its factorization.

1292601561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430867190.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 1292601561 is about 35952.7684747642. The cubic root of 1292601561 is about 1089.3185317543.

The spelling of 1292601561 in words is "one billion, two hundred ninety-two million, six hundred one thousand, five hundred sixty-one".