1551891954 has 16 divisors (see below), whose sum is σ = 3286359648. Its totient is φ = 486868032.

The previous prime is 1551891953. The next prime is 1551891959. The reversal of 1551891954 is 4591981551.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1551891953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7607212 + ... + 7607415.

It is an arithmetic number, because the mean of its divisors is an integer number (205397478).

Almost surely, 2^1551891954 is an apocalyptic number.

1551891954 is an abundant number, since it is smaller than the sum of its proper divisors (1734467694).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1551891954 is a wasteful number, since it uses less digits than its factorization.

1551891954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15214649.

The product of its digits is 324000, while the sum is 48.

The square root of 1551891954 is about 39394.0598821701. The cubic root of 1551891954 is about 1157.7652063486.

The spelling of 1551891954 in words is "one billion, five hundred fifty-one million, eight hundred ninety-one thousand, nine hundred fifty-four".