5621091951 has 4 divisors (see below), whose sum is σ = 7494789272. Its totient is φ = 3747394632.

The previous prime is 5621091941. The next prime is 5621091979. The reversal of 5621091951 is 1591901265.

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

It is not a de Polignac number, because 5621091951 - 2⁵ = 5621091919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5621091941) 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, 936848656 + ... + 936848661.

It is an arithmetic number, because the mean of its divisors is an integer number (1873697318).

Almost surely, 2^5621091951 is an apocalyptic number.

5621091951 is a deficient number, since it is larger than the sum of its proper divisors (1873697321).

5621091951 is a wasteful number, since it uses less digits than its factorization.

5621091951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1873697320.

The product of its (nonzero) digits is 24300, while the sum is 39.

The square root of 5621091951 is about 74973.9418131393. The cubic root of 5621091951 is about 1778.0346897633.

The spelling of 5621091951 in words is "five billion, six hundred twenty-one million, ninety-one thousand, nine hundred fifty-one".