7621115401 has 3 divisors (see below), whose sum is σ = 7621202701. Its totient is φ = 7621028102.

The previous prime is 7621115399. The next prime is 7621115461. The reversal of 7621115401 is 1045111267.

The square root of 7621115401 is 87299.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1045111267 = 71 ⋅14719877.

It is not a de Polignac number, because 7621115401 - 2¹ = 7621115399 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7621115401.

It is not an unprimeable number, because it can be changed into a prime (7621115461) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 43650 + ... + 130948.

Almost surely, 2^7621115401 is an apocalyptic number.

7621115401 is the 87299-th square number.

7621115401 is the 43650-th centered octagonal number.

It is an amenable number.

7621115401 is a deficient number, since it is larger than the sum of its proper divisors (87300).

7621115401 is an frugal number, since it uses more digits than its factorization.

7621115401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174598 (or 87299 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 28.

The cubic root of 7621115401 is about 1967.9142896806.

Adding to 7621115401 its reverse (1045111267), we get a palindrome (8666226668).

The spelling of 7621115401 in words is "seven billion, six hundred twenty-one million, one hundred fifteen thousand, four hundred one".