5401021631 has 4 divisors (see below), whose sum is σ = 5403558264. Its totient is φ = 5398485000.

The previous prime is 5401021597. The next prime is 5401021651. The reversal of 5401021631 is 1361201045.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1361201045 = 5 ⋅272240209.

It is a cyclic number.

It is not a de Polignac number, because 5401021631 - 2¹⁸ = 5400759487 is a prime.

It is a super-2 number, since 2×5401021631² = 58342069317059800322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5401021597 and 5401021606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5401021651) 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, 1265120 + ... + 1269381.

It is an arithmetic number, because the mean of its divisors is an integer number (1350889566).

Almost surely, 2^5401021631 is an apocalyptic number.

5401021631 is a deficient number, since it is larger than the sum of its proper divisors (2536633).

5401021631 is a wasteful number, since it uses less digits than its factorization.

5401021631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2536632.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 5401021631 is about 73491.6432732321. The cubic root of 5401021631 is about 1754.5212754758.

Adding to 5401021631 its reverse (1361201045), we get a palindrome (6762222676).

The spelling of 5401021631 in words is "five billion, four hundred one million, twenty-one thousand, six hundred thirty-one".