1290235261 has 8 divisors (see below), whose sum is σ = 1552162880. Its totient is φ = 1047709728.

The previous prime is 1290235241. The next prime is 1290235279. The reversal of 1290235261 is 1625320921.

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

It is a cyclic number.

It is not a de Polignac number, because 1290235261 - 2⁵ = 1290235229 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 (1290235241) 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, 4850376 + ... + 4850641.

It is an arithmetic number, because the mean of its divisors is an integer number (194020360).

Almost surely, 2^1290235261 is an apocalyptic number.

It is an amenable number.

1290235261 is a deficient number, since it is larger than the sum of its proper divisors (261927619).

1290235261 is an equidigital number, since it uses as much as digits as its factorization.

1290235261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9701043.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1290235261 is about 35919.8449467700. The cubic root of 1290235261 is about 1088.6534056891.

It can be divided in two parts, 1290235 and 261, that added together give a square (1290496 = 1136²).

The spelling of 1290235261 in words is "one billion, two hundred ninety million, two hundred thirty-five thousand, two hundred sixty-one".