1951515151 has 2 divisors, whose sum is σ = 1951515152. Its totient is φ = 1951515150.

The previous prime is 1951515149. The next prime is 1951515169. The reversal of 1951515151 is 1515151591.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1951515151 - 2¹ = 1951515149 is a prime.

It is a super-2 number, since 2×1951515151² = 7616822769165105602, which contains 22 as substring.

Together with 1951515149, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1951515451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 975757575 + 975757576.

It is an arithmetic number, because the mean of its divisors is an integer number (975757576).

Almost surely, 2^1951515151 is an apocalyptic number.

1951515151 is a deficient number, since it is larger than the sum of its proper divisors (1).

1951515151 is an equidigital number, since it uses as much as digits as its factorization.

1951515151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5625, while the sum is 34.

The square root of 1951515151 is about 44175.9567072406. The cubic root of 1951515151 is about 1249.6564711457.

The spelling of 1951515151 in words is "one billion, nine hundred fifty-one million, five hundred fifteen thousand, one hundred fifty-one".