1513991 has 2 divisors, whose sum is σ = 1513992. Its totient is φ = 1513990.

The previous prime is 1513973. The next prime is 1514027. The reversal of 1513991 is 1993151.

It is a weak prime.

It is an emirp because it is prime and its reverse (1993151) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1513991 - 2⁶ = 1513927 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1513921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 756995 + 756996.

It is an arithmetic number, because the mean of its divisors is an integer number (756996).

2^1513991 is an apocalyptic number.

1513991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1513991 is an equidigital number, since it uses as much as digits as its factorization.

1513991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1215, while the sum is 29.

The square root of 1513991 is about 1230.4434160090. The cubic root of 1513991 is about 114.8262277847.

The spelling of 1513991 in words is "one million, five hundred thirteen thousand, nine hundred ninety-one".