1551960391 has 2 divisors, whose sum is σ = 1551960392. Its totient is φ = 1551960390.

The previous prime is 1551960383. The next prime is 1551960407. The reversal of 1551960391 is 1930691551.

It is a weak prime.

It is an emirp because it is prime and its reverse (1930691551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1551960391 - 2³ = 1551960383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1551960341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775980195 + 775980196.

It is an arithmetic number, because the mean of its divisors is an integer number (775980196).

Almost surely, 2^1551960391 is an apocalyptic number.

1551960391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551960391 is an equidigital number, since it uses as much as digits as its factorization.

1551960391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36450, while the sum is 40.

The square root of 1551960391 is about 39394.9284933987. The cubic root of 1551960391 is about 1157.7822248901.

The spelling of 1551960391 in words is "one billion, five hundred fifty-one million, nine hundred sixty thousand, three hundred ninety-one".