290912121 has 8 divisors (see below), whose sum is σ = 430980960. Its totient is φ = 193941396.

The previous prime is 290912117. The next prime is 290912123. The reversal of 290912121 is 121219092.

It is not a de Polignac number, because 290912121 - 2² = 290912117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 10774523 = 290912121 / (2 + 9 + 0 + 9 + 1 + 2 + 1 + 2 + 1).

It is not an unprimeable number, because it can be changed into a prime (290912123) 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, 5387235 + ... + 5387288.

It is an arithmetic number, because the mean of its divisors is an integer number (53872620).

Almost surely, 2^290912121 is an apocalyptic number.

It is an amenable number.

290912121 is a deficient number, since it is larger than the sum of its proper divisors (140068839).

290912121 is a wasteful number, since it uses less digits than its factorization.

290912121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10774532 (or 10774526 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 290912121 is about 17056.1461356310. The cubic root of 290912121 is about 662.6038254746.

The spelling of 290912121 in words is "two hundred ninety million, nine hundred twelve thousand, one hundred twenty-one".