1621152154 has 4 divisors (see below), whose sum is σ = 2431728234. Its totient is φ = 810576076.

The previous prime is 1621152121. The next prime is 1621152163. The reversal of 1621152154 is 4512511261.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1041546529 + 579605625 = 32273^2 + 24075^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405288037 + ... + 405288040.

Almost surely, 2^1621152154 is an apocalyptic number.

1621152154 is a deficient number, since it is larger than the sum of its proper divisors (810576080).

1621152154 is an equidigital number, since it uses as much as digits as its factorization.

1621152154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810576079.

The product of its digits is 2400, while the sum is 28.

The square root of 1621152154 is about 40263.5337992084. The cubic root of 1621152154 is about 1174.7386541734.

The spelling of 1621152154 in words is "one billion, six hundred twenty-one million, one hundred fifty-two thousand, one hundred fifty-four".