620101631 has 4 divisors (see below), whose sum is σ = 620289600. Its totient is φ = 619913664.

The previous prime is 620101621. The next prime is 620101633. The reversal of 620101631 is 136101026.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 620101631 - 2¹⁸ = 619839487 is a prime.

It is a super-2 number, since 2×620101631² = 769052065537720322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620101633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88946 + ... + 95663.

It is an arithmetic number, because the mean of its divisors is an integer number (155072400).

Almost surely, 2^620101631 is an apocalyptic number.

620101631 is a deficient number, since it is larger than the sum of its proper divisors (187969).

620101631 is a wasteful number, since it uses less digits than its factorization.

620101631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187968.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 620101631 is about 24901.8399119422. The cubic root of 620101631 is about 852.7484876894.

Adding to 620101631 its reverse (136101026), we get a palindrome (756202657).

The spelling of 620101631 in words is "six hundred twenty million, one hundred one thousand, six hundred thirty-one".