1621531247151 has 16 divisors (see below), whose sum is σ = 2229479875584. Its totient is φ = 1047748336224.

The previous prime is 1621531247101. The next prime is 1621531247177. The reversal of 1621531247151 is 1517421351261.

It is a de Polignac number, because none of the positive numbers 2^k-1621531247151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621531247101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55811796 + ... + 55840841.

It is an arithmetic number, because the mean of its divisors is an integer number (139342492224).

Almost surely, 2^{1621531247151} is an apocalyptic number.

1621531247151 is a deficient number, since it is larger than the sum of its proper divisors (607948628433).

1621531247151 is a wasteful number, since it uses less digits than its factorization.

1621531247151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111652790.

The product of its digits is 50400, while the sum is 39.

The spelling of 1621531247151 in words is "one trillion, six hundred twenty-one billion, five hundred thirty-one million, two hundred forty-seven thousand, one hundred fifty-one".