621920071 has 4 divisors (see below), whose sum is σ = 632115544. Its totient is φ = 611724600.

The previous prime is 621920041. The next prime is 621920093. The reversal of 621920071 is 170029126.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 170029126 = 2 ⋅85014563.

It is a cyclic number.

It is not a de Polignac number, because 621920071 - 2⁷ = 621919943 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 (621920041) 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, 5097645 + ... + 5097766.

It is an arithmetic number, because the mean of its divisors is an integer number (158028886).

Almost surely, 2^621920071 is an apocalyptic number.

621920071 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

621920071 is a deficient number, since it is larger than the sum of its proper divisors (10195473).

621920071 is a wasteful number, since it uses less digits than its factorization.

621920071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10195472.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 621920071 is about 24938.3253447380. The cubic root of 621920071 is about 853.5812321794.

Adding to 621920071 its reverse (170029126), we get a palindrome (791949197).

The spelling of 621920071 in words is "six hundred twenty-one million, nine hundred twenty thousand, seventy-one".