1990087151 has 24 divisors (see below), whose sum is σ = 2312817360. Its totient is φ = 1697518080.

The previous prime is 1990087147. The next prime is 1990087159. The reversal of 1990087151 is 1517800991.

It is not a de Polignac number, because 1990087151 - 2² = 1990087147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1990087099 and 1990087108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990087159) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 412811 + ... + 417603.

It is an arithmetic number, because the mean of its divisors is an integer number (96367390).

Almost surely, 2^1990087151 is an apocalyptic number.

1990087151 is a deficient number, since it is larger than the sum of its proper divisors (322730209).

1990087151 is a wasteful number, since it uses less digits than its factorization.

1990087151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4907 (or 4866 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 41.

The square root of 1990087151 is about 44610.3928586154. The cubic root of 1990087151 is about 1257.8360334959.

The spelling of 1990087151 in words is "one billion, nine hundred ninety million, eighty-seven thousand, one hundred fifty-one".