1551099942 has 80 divisors (see below), whose sum is σ = 4100355072. Its totient is φ = 428865840.

The previous prime is 1551099919. The next prime is 1551099943. The reversal of 1551099942 is 2499901551.

1551099942 is a `hidden beast` number, since 1 + 5 + 510 + 9 + 99 + 42 = 666.

1551099942 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1551099942² = 4811822060144806728, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551099943) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 13093 + ... + 57215.

Almost surely, 2^1551099942 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1551099942, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2050177536).

1551099942 is an abundant number, since it is smaller than the sum of its proper divisors (2549255130).

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

1551099942 is a wasteful number, since it uses less digits than its factorization.

1551099942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44175 (or 44166 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 45.

The square root of 1551099942 is about 39384.0061700178. The cubic root of 1551099942 is about 1157.5682166956.

The spelling of 1551099942 in words is "one billion, five hundred fifty-one million, ninety-nine thousand, nine hundred forty-two".