631098021 has 32 divisors (see below), whose sum is σ = 907562880. Its totient is φ = 388675584.

The previous prime is 631098019. The next prime is 631098023. The reversal of 631098021 is 120890136.

It is an interprime number because it is at equal distance from previous prime (631098019) and next prime (631098023).

It is not a de Polignac number, because 631098021 - 2¹ = 631098019 is a prime.

It is a super-2 number, since 2×631098021² = 796569424220232882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 631098021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631098023) 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, 739431 + ... + 740283.

It is an arithmetic number, because the mean of its divisors is an integer number (28361340).

Almost surely, 2^631098021 is an apocalyptic number.

It is an amenable number.

631098021 is a deficient number, since it is larger than the sum of its proper divisors (276464859).

631098021 is a wasteful number, since it uses less digits than its factorization.

631098021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 631098021 is about 25121.6643755942. The cubic root of 631098021 is about 857.7596370296.

The spelling of 631098021 in words is "six hundred thirty-one million, ninety-eight thousand, twenty-one".