1551980949 has 32 divisors (see below), whose sum is σ = 2228425344. Its totient is φ = 957265920.

The previous prime is 1551980939. The next prime is 1551980951. The reversal of 1551980949 is 9490891551.

It is not a de Polignac number, because 1551980949 - 2⁵ = 1551980917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551980909) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1648819 + ... + 1649759.

It is an arithmetic number, because the mean of its divisors is an integer number (69638292).

Almost surely, 2^1551980949 is an apocalyptic number.

It is an amenable number.

1551980949 is a deficient number, since it is larger than the sum of its proper divisors (676444395).

1551980949 is a wasteful number, since it uses less digits than its factorization.

1551980949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1477.

The product of its (nonzero) digits is 583200, while the sum is 51.

The square root of 1551980949 is about 39395.1894144450. The cubic root of 1551980949 is about 1157.7873370441.

The spelling of 1551980949 in words is "one billion, five hundred fifty-one million, nine hundred eighty thousand, nine hundred forty-nine".