154530491621 has 24 divisors (see below), whose sum is σ = 181563947712. Its totient is φ = 131096820800.

The previous prime is 154530491617. The next prime is 154530491629. The reversal of 154530491621 is 126194035451.

It is not a de Polignac number, because 154530491621 - 2² = 154530491617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154530491629) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 563051 + ... + 791256.

It is an arithmetic number, because the mean of its divisors is an integer number (7565164488).

Almost surely, 2^154530491621 is an apocalyptic number.

154530491621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

154530491621 is a deficient number, since it is larger than the sum of its proper divisors (27033456091).

154530491621 is a wasteful number, since it uses less digits than its factorization.

154530491621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1354393 (or 1354382 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 41.

The spelling of 154530491621 in words is "one hundred fifty-four billion, five hundred thirty million, four hundred ninety-one thousand, six hundred twenty-one".