620531901 has 32 divisors (see below), whose sum is σ = 1016653440. Its totient is φ = 370915200.

The previous prime is 620531837. The next prime is 620531903. The reversal of 620531901 is 109135026.

620531901 is a `hidden beast` number, since 620 + 5 + 31 + 9 + 0 + 1 = 666.

It is not a de Polignac number, because 620531901 - 2⁶ = 620531837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620531903) 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, 7371 + ... + 35991.

It is an arithmetic number, because the mean of its divisors is an integer number (31770420).

Almost surely, 2^620531901 is an apocalyptic number.

It is an amenable number.

620531901 is a deficient number, since it is larger than the sum of its proper divisors (396121539).

620531901 is a wasteful number, since it uses less digits than its factorization.

620531901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28714 (or 28708 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 620531901 is about 24910.4777352824. The cubic root of 620531901 is about 852.9456743241.

Adding to 620531901 its reverse (109135026), we get a palindrome (729666927).

The spelling of 620531901 in words is "six hundred twenty million, five hundred thirty-one thousand, nine hundred one".