851015401 has 2 divisors, whose sum is σ = 851015402. Its totient is φ = 851015400.

The previous prime is 851015309. The next prime is 851015423. The reversal of 851015401 is 104510158.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 638876176 + 212139225 = 25276^2 + 14565^2 .

It is a cyclic number.

It is not a de Polignac number, because 851015401 - 2⁷ = 851015273 is a prime.

It is not a weakly prime, because it can be changed into another prime (851015471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425507700 + 425507701.

It is an arithmetic number, because the mean of its divisors is an integer number (425507701).

Almost surely, 2^851015401 is an apocalyptic number.

It is an amenable number.

851015401 is a deficient number, since it is larger than the sum of its proper divisors (1).

851015401 is an equidigital number, since it uses as much as digits as its factorization.

851015401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 800, while the sum is 25.

The square root of 851015401 is about 29172.1682601757. The cubic root of 851015401 is about 947.6452859550.

Adding to 851015401 its reverse (104510158), we get a palindrome (955525559).

The spelling of 851015401 in words is "eight hundred fifty-one million, fifteen thousand, four hundred one".