1621402145 has 32 divisors (see below), whose sum is σ = 2306396160. Its totient is φ = 1081080000.

The previous prime is 1621402127. The next prime is 1621402177. The reversal of 1621402145 is 5412041261.

It is not a de Polignac number, because 1621402145 - 2¹⁰ = 1621401121 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7370 + ... + 57420.

It is an arithmetic number, because the mean of its divisors is an integer number (72074880).

Almost surely, 2^1621402145 is an apocalyptic number.

It is an amenable number.

1621402145 is a deficient number, since it is larger than the sum of its proper divisors (684994015).

1621402145 is a wasteful number, since it uses less digits than its factorization.

1621402145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50117.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 1621402145 is about 40266.6381139523. The cubic root of 1621402145 is about 1174.7990348922.

The spelling of 1621402145 in words is "one billion, six hundred twenty-one million, four hundred two thousand, one hundred forty-five".