423251661 has 48 divisors (see below), whose sum is σ = 673712640. Its totient is φ = 235599840.

The previous prime is 423251639. The next prime is 423251683. The reversal of 423251661 is 166152324.

It is an interprime number because it is at equal distance from previous prime (423251639) and next prime (423251683).

It is not a de Polignac number, because 423251661 - 2⁶ = 423251597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423251161) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1116570 + ... + 1116948.

It is an arithmetic number, because the mean of its divisors is an integer number (14035680).

Almost surely, 2^423251661 is an apocalyptic number.

It is an amenable number.

423251661 is a deficient number, since it is larger than the sum of its proper divisors (250460979).

423251661 is a wasteful number, since it uses less digits than its factorization.

423251661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574 (or 567 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 423251661 is about 20573.0809797658. The cubic root of 423251661 is about 750.8149133454.

The spelling of 423251661 in words is "four hundred twenty-three million, two hundred fifty-one thousand, six hundred sixty-one".