621147145 has 16 divisors (see below), whose sum is σ = 795363840. Its totient is φ = 464310144.

The previous prime is 621147127. The next prime is 621147161. The reversal of 621147145 is 541741126.

It is not a de Polignac number, because 621147145 - 2⁵ = 621147113 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37849 + ... + 51718.

It is an arithmetic number, because the mean of its divisors is an integer number (49710240).

Almost surely, 2^621147145 is an apocalyptic number.

It is an amenable number.

621147145 is a deficient number, since it is larger than the sum of its proper divisors (174216695).

621147145 is a wasteful number, since it uses less digits than its factorization.

621147145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89664.

The product of its digits is 6720, while the sum is 31.

The square root of 621147145 is about 24922.8237766109. The cubic root of 621147145 is about 853.2274736269.

The spelling of 621147145 in words is "six hundred twenty-one million, one hundred forty-seven thousand, one hundred forty-five".