61651019 has 2 divisors, whose sum is σ = 61651020. Its totient is φ = 61651018.

The previous prime is 61650997. The next prime is 61651021. The reversal of 61651019 is 91015616.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61651019 is a prime.

It is a super-2 number, since 2×61651019² = 7601696287476722, which contains 22 as substring.

Together with 61651021, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 61650982 and 61651000.

It is not a weakly prime, because it can be changed into another prime (61651039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30825509 + 30825510.

It is an arithmetic number, because the mean of its divisors is an integer number (30825510).

Almost surely, 2^61651019 is an apocalyptic number.

61651019 is a deficient number, since it is larger than the sum of its proper divisors (1).

61651019 is an equidigital number, since it uses as much as digits as its factorization.

61651019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 61651019 is about 7851.8162866944. The cubic root of 61651019 is about 395.0451670831.

The spelling of 61651019 in words is "sixty-one million, six hundred fifty-one thousand, nineteen".