1551998951 has 2 divisors, whose sum is σ = 1551998952. Its totient is φ = 1551998950.

The previous prime is 1551998927. The next prime is 1551999041. The reversal of 1551998951 is 1598991551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1551998951 - 2²² = 1547804647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1551998893 and 1551998902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1551908951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775999475 + 775999476.

It is an arithmetic number, because the mean of its divisors is an integer number (775999476).

Almost surely, 2^1551998951 is an apocalyptic number.

1551998951 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551998951 is an equidigital number, since it uses as much as digits as its factorization.

1551998951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 729000, while the sum is 53.

The square root of 1551998951 is about 39395.4178934556. The cubic root of 1551998951 is about 1157.7918135611.

The spelling of 1551998951 in words is "one billion, five hundred fifty-one million, nine hundred ninety-eight thousand, nine hundred fifty-one".