1290220491 has 32 divisors (see below), whose sum is σ = 2090769408. Its totient is φ = 690877440.

The previous prime is 1290220487. The next prime is 1290220493. The reversal of 1290220491 is 1940220921.

It is a happy number.

It is not a de Polignac number, because 1290220491 - 2² = 1290220487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1290220493) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75426 + ... + 90936.

It is an arithmetic number, because the mean of its divisors is an integer number (65336544).

Almost surely, 2^1290220491 is an apocalyptic number.

1290220491 is a deficient number, since it is larger than the sum of its proper divisors (800548917).

1290220491 is a wasteful number, since it uses less digits than its factorization.

1290220491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15771.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 1290220491 is about 35919.6393495258. The cubic root of 1290220491 is about 1088.6492515443.

The spelling of 1290220491 in words is "one billion, two hundred ninety million, two hundred twenty thousand, four hundred ninety-one".