621133541 has 32 divisors (see below), whose sum is σ = 774908160. Its totient is φ = 485968896.

The previous prime is 621133523. The next prime is 621133547. The reversal of 621133541 is 145331126.

It is not a de Polignac number, because 621133541 - 2¹⁸ = 620871397 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 621133541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621133547) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 555515 + ... + 556631.

It is an arithmetic number, because the mean of its divisors is an integer number (24215880).

Almost surely, 2^621133541 is an apocalyptic number.

It is an amenable number.

621133541 is a deficient number, since it is larger than the sum of its proper divisors (153774619).

621133541 is a wasteful number, since it uses less digits than its factorization.

621133541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1293.

The product of its digits is 2160, while the sum is 26.

The square root of 621133541 is about 24922.5508525913. The cubic root of 621133541 is about 853.2212446191.

Adding to 621133541 its reverse (145331126), we get a palindrome (766464667).

The spelling of 621133541 in words is "six hundred twenty-one million, one hundred thirty-three thousand, five hundred forty-one".