902601661 has 4 divisors (see below), whose sum is σ = 972032572. Its totient is φ = 833170752.

The previous prime is 902601649. The next prime is 902601709. The reversal of 902601661 is 166106209.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166106209 = 37 ⋅4489357.

It can be written as a sum of positive squares in 2 ways, for example, as 433056100 + 469545561 = 20810^2 + 21669^2 .

It is a cyclic number.

It is not a de Polignac number, because 902601661 - 2⁷ = 902601533 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 (902602661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34715436 + ... + 34715461.

It is an arithmetic number, because the mean of its divisors is an integer number (243008143).

Almost surely, 2^902601661 is an apocalyptic number.

It is an amenable number.

902601661 is a deficient number, since it is larger than the sum of its proper divisors (69430911).

902601661 is a wasteful number, since it uses less digits than its factorization.

902601661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69430910.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 902601661 is about 30043.3297255814. The cubic root of 902601661 is about 966.4188140755.

The spelling of 902601661 in words is "nine hundred two million, six hundred one thousand, six hundred sixty-one".