1951654913021 has 4 divisors (see below), whose sum is σ = 2129078086944. Its totient is φ = 1774231739100.

The previous prime is 1951654913003. The next prime is 1951654913023. The reversal of 1951654913021 is 1203194561591.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1951654913021 - 2⁶ = 1951654912957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1951654913023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88711586945 + ... + 88711586966.

It is an arithmetic number, because the mean of its divisors is an integer number (532269521736).

Almost surely, 2^{1951654913021} is an apocalyptic number.

1951654913021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1951654913021 is a deficient number, since it is larger than the sum of its proper divisors (177423173923).

1951654913021 is a wasteful number, since it uses less digits than its factorization.

1951654913021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177423173922.

The product of its (nonzero) digits is 291600, while the sum is 47.

The spelling of 1951654913021 in words is "one trillion, nine hundred fifty-one billion, six hundred fifty-four million, nine hundred thirteen thousand, twenty-one".