615421901 has 16 divisors (see below), whose sum is σ = 641292288. Its totient is φ = 590198400.

The previous prime is 615421897. The next prime is 615421903. The reversal of 615421901 is 109124516.

It is a cyclic number.

It is not a de Polignac number, because 615421901 - 2² = 615421897 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 (615421903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 620516 + ... + 621506.

It is an arithmetic number, because the mean of its divisors is an integer number (40080768).

Almost surely, 2^615421901 is an apocalyptic number.

It is an amenable number.

615421901 is a deficient number, since it is larger than the sum of its proper divisors (25870387).

615421901 is a wasteful number, since it uses less digits than its factorization.

615421901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1292.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 615421901 is about 24807.6984220625. The cubic root of 615421901 is about 850.5979188666.

The spelling of 615421901 in words is "six hundred fifteen million, four hundred twenty-one thousand, nine hundred one".