401516539 has 4 divisors (see below), whose sum is σ = 402178624. Its totient is φ = 400854456.

The previous prime is 401516491. The next prime is 401516561. The reversal of 401516539 is 935615104.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401516539 is a prime.

It is a super-2 number, since 2×401516539² = 322431062181077042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401516639) 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, 330132 + ... + 331345.

It is an arithmetic number, because the mean of its divisors is an integer number (100544656).

Almost surely, 2^401516539 is an apocalyptic number.

401516539 is a deficient number, since it is larger than the sum of its proper divisors (662085).

401516539 is an equidigital number, since it uses as much as digits as its factorization.

401516539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662084.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 401516539 is about 20037.8776071719. The cubic root of 401516539 is about 737.7362883206.

The spelling of 401516539 in words is "four hundred one million, five hundred sixteen thousand, five hundred thirty-nine".